45D0028 11
VENT INSTALLATION
Always maintain minimum clearances around vent systems. The minimum clearances
to combustibles for horizontal vent pipe are 2" at the top and 1" at the sides and bottom
of the vent system. For wall firestops, a 1" minimum clearance all around the pipe must
be maintained. Do not pack the open air spaces with insulation or other materials. This
could cause high temperatures and may present a fire hazard.
WARNING
Figure 6 - Horizontal Vent Termination Location
Vent Terminal Air Supply Inlet Area Where Terminals Not Permitted
Inside Corner Detail FOR HORIZONTAL TERMINATION
MINIMUM DISTANCES
A = Clearance above the grade, a veranda, porch, deck, or balcony [*12" (305mm) minimum].
B = Clearance to window or door that may be opened [*12" (305mm) minimum].
C = Clearance to permanently closed window [*minimum 12" (305mm) recommended to prevent condensation on
window]
D
= Vertical clearance to ventilated soft located above the terminal within a horizontal distance of two (2) feet (610mm)
from the centerline of the terminal [18" (457mm) minimum].
E
= Clearance to unventilated softs [12" (305mm) minimum]. Clearance to vinyl soft [30" (762mm)].
F = Clearance to an outside corner. See page 12.
G = Clearance to an inside corner. See page 12.
H = *Not to be installed above a gas meter/regulator assembly within three (3) feet (914mm) horizontally from the centerline
of the regulator.
I = Clearance to service regulator vent outlet [*3' (914mm) minimum].
J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance [*12"
(305mm)minimum].
K = Clearance to a mechanical air supply inlet [*6' (1829mm) minimum].
L
= Clearance above a paved sidewalk or paved driveway located on public property [
**
7' (2133mm) minimum].
M
= Clearance under veranda, porch, deck, or balcony [*12" (305mm) minimum
***
].
N = Clearance above a roof shall extend a minimum of 24" (610mm) above the highest point when it passes through the roof
surface and any other obstruction within a horizontal distance of 18" (457mm).
* As specified in CAN/CGA B149 Installation Codes. Note: Local codes or regulations may require different
clearances.
** A vent must not terminate directly above a sidewalk or paved driveway, which is located between two single-family
dwellings and serves both dwellings.
*** Only permitted if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
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